uvm_fault(0xffffffff83a282c8, 0xffff800029ee6000, 0, 2) -> e
kernel: page fault trap, code=2
Stopped at      kcov_remote_enter+0x122:        movq    $0,0(%rcx)
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
* 35336   1845      0           0  0x4000000    0  syz-executor
kcov_remote_enter(0,ffff80002a79db10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff83937940,ffff80002ccb0b10) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002ccb0b10,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756
softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788
softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
vn_ioctl(fffffd80784919e0,84946467,ffff800001560800,ffff80002a848030) at vn_ioctl+0x276 sys/kern/vfs_vnops.c:553
sys_ioctl(ffff80002a848030,ffff80002a877770,ffff80002a8776c0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80002a877770) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a877770) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xf3a16d684b0, count: 4
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports.  Insufficient info makes it difficult to find and fix bugs.
ddb> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xffffffff83a282c8, 0xffff800029ee6000, 0, 2) -> e
ddb> trace
kcov_remote_enter(0,ffff80002a79db10) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff83937940,ffff80002ccb0b10) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002ccb0b10,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756
softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788
softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
vn_ioctl(fffffd80784919e0,84946467,ffff800001560800,ffff80002a848030) at vn_ioctl+0x276 sys/kern/vfs_vnops.c:553
sys_ioctl(ffff80002a848030,ffff80002a877770,ffff80002a8776c0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80002a877770) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a877770) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xf3a16d684b0, count: -11
ddb> show registers
rdi                       0xffffffff
rsi               0xffff800000c16c00
rbp               0xffff80002a877300
rbx               0xffff80002a79db10
rdx               0xffff80002a848030
rcx               0xffff800029ee6000
rax               0xfffffd806ca8fe10
r8                                 0
r9                                 0
r10               0xd8d0e9939effd7e5
r11               0x6c8cd2e48e770bea
r12               0xffffffff81a10330    endtsleep
r13               0xffff80002ccb0a78
r14               0xffff80002a79db10
r15                                0
rip               0xffffffff8333bb32    kcov_remote_enter+0x122
cs                               0x8
rflags                       0x10297    __ALIGN_SIZE+0xf297
rsp               0xffff80002a8772e0
ss                              0x10
kcov_remote_enter+0x122:        movq    $0,0(%rcx)
ddb> show proc
PROC (syz-executor) tid=35336 pid=1845 tcnt=2 stat=onproc
    flags process=0 proc=4000000<THREAD>
    runpri=50, usrpri=50, slppri=17, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff80002a849788,0xffffffff83a32ab8
    process=0xffff8000ffffb198 user=0xffff80002a872000, vmspace=0xfffffd806c7fce70
    estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=1
ddb>